I am currently making a game where I have several platforms flying around the screen. I have grouped all of them using the display.newGroup() and inserting them into that group. I would like to move these multiple platforms (which are all the same) a fixed distance at the same time. How would I do that?
I have tried using translation, but then, it seems that I can not move all of them a 'fixed' distance using it. Is there any other option?
Use transition instead of translation, here s an example
local group = display.newGroup()
group.x = value
group.y = value
-- (1) move square to bottom right corner; subtract half side-length
transition.to( group , { time=1500, alpha=0, x=(w-50), y=(h-50), onComplete=listener1 } )
For more details,
https://docs.coronalabs.com/api/library/transition/to.html#examples
Related
Is there any way I could make a ball, that blinks? I would like to use two colors, so it blinks first with one color, then the other. I have no idea how to do this.
local ball = display.newCircle(10,10,10)
Have You checked Corona SDK API Reference ?
To quote an example:
local square = display.newRect( 0, 0, 100, 100 )
transition.blink( square, { time=1000 } )
To address the second part of Your question, I guess, You could use onStart and onRepeat parameters. Changing the primary color accordingly to blink counter on start and increasing counter of blinks on repeat.
I am creating a game which uses accelerometer to move ball (football model game).
function acc(e)
physics.setGravity(e.xInstant*(screenW/4), -1*e.yInstant*(screenH/4))
end
But this code not giving a smooth flow of game. Can u guys help me for right option
You either need to "calibrate" or to change the algorithm. I would try calibrate first: replace your acc() with
function acc(e)
local calibX = 1
local calibY = 1
-- physics.setGravity(calibX * e.xInstant*(screenW/4), -calibY * e.yInstant*(screenH/4))
print(e.xInstant, e.yInstant, e.zInstant)
end
and do the tilting that you feel is "not smooth", looking at the values printed when you do that. This will tell you what calibX and Y should be, set them then uncomment the physics line, comment out the print line, try again, until you get it right. For example, if the x and y instant are around 10, you could try calibX = 0.1 or less.
If you can't find values for calibration coefficients that give you desired motion, you need to change your algorithm. For example, if you are trying to simulate the tilt of your device as though it was a table on which a marble rolls, and tilting the table should make marble move, then changing gravity is not the way to do it. You want to apply a horizontal force which is equal to g*sin(theta) where g is gravity and theta is the tilt angle of the device side-to-side. The formula is slightly more complex if you allow tilt along the other direction.
Hello in a game I'm making using lua in Marmalade Quick,I have run into a problem with the physics.
I have a normal downward y gravity and have some notes that is affected by that.
Now I want to add some objects that "fly" horizontally on the X axis but I can not get it to work.
so one of the notes looks like this:
sky2 = director:createSprite(dw, 40, "textures/tractor.png")
physics:addNode(sky2, {type="dynamic"})
sky2.physics:setGravityScale(0)
my first thought was to
just add the following to an update listener
if(gameplaying == true) then
sky2.x = sky2.x-2.5
unfortunately this does not work after the node has got added physics
then I was looking into using
sky2.physics:applyapplyLinearImpulse or sky2.physics:applyForce
I used it like this
sky2.physics:applyapplyLinearImpulse(-10, 0, -20, 40)
The problem here is that the node then correctly moves along the axis but it is spinnig around (torque effects)..
Is there away to stop this or what am I doing wrong,,
thanks..
Found out that the Marmalade Quick Documentation was wrong, and to not input both a px and a px value but just 0 so sky2.physics:applyapplyLinearImpulse(-10, 0) this will apply the impulse at the centre of mass and make it move straight.
I got a few tower like things that a ball can jump on them.
The problem is that I can't make the towers move like +5 to left and still be collided.
Can someone help me?
CODE
_G.mainGroup = display.newGroup()
local rect=display.newRect( 200, 400, 100, 100 )
physics.addBody(rect, "static", {density= 3,friction= 0.2})
mainGroup:insert(rect)
-- timer.performWithDelay(1, function(e)
-- mainGroup.x = mainGroup.x - 4
-- end, 0 )
I tried this in my code. and the rectangle moves without collison with a ball but it leaves behind a invisible replica which has collision becoz a ball is able to bounce on it.
You should use kinematic objects instead of static objects. Static objects are used for objects which should stay stable for a long time. Kinematic objects can be stable in small times.
How to make a 2d world with fixed size, which would repeat itself when reached any side of the map?
When you reach a side of a map you see the opposite side of the map which merged togeather with this one. The idea is that if you didn't have a minimap you would not even notice the transition of map repeating itself.
I have a few ideas how to make it:
1) Keeping total of 3x3 world like these all the time which are exactly the same and updated the same way, just the players exists in only one of them.
2) Another way would be to seperate the map into smaller peaces and add them to required place when asked.
Either way it can be complicated to complete it. I remember that more thatn 10 years ago i played some game like that with soldiers following each other in a repeating wold shooting other AI soldiers.
Mostly waned to hear your thoughts about the idea and how it could be achieved. I'm coding in XNA(C#).
Another alternative is to generate noise using libnoise libraries. The beauty of this is that you can generate noise over a theoretical infinite amount of space.
Take a look at the following:
http://libnoise.sourceforge.net/tutorials/tutorial3.html#tile
There is also an XNA port of the above at: http://bigblackblock.com/tools/libnoisexna
If you end up using the XNA port, you can do something like this:
Perlin perlin = new Perlin();
perlin.Frequency = 0.5f; //height
perlin.Lacunarity = 2f; //frequency increase between octaves
perlin.OctaveCount = 5; //Number of passes
perlin.Persistence = 0.45f; //
perlin.Quality = QualityMode.High;
perlin.Seed = 8;
//Create our 2d map
Noise2D _map = new Noise2D(CHUNKSIZE_WIDTH, CHUNKSIZE_HEIGHT, perlin);
//Get a section
_map.GeneratePlanar(left, right, top, down);
GeneratePlanar is the function to call to get the sections in each direction that will connect seamlessly with the rest of your world.
If the game is tile based I think what you should do is:
Keep only one array for the game area.
Determine the visible area using modulo arithmetics over the size of the game area mod w and h where these are the width and height of the table.
E.g. if the table is 80x100 (0,0) top left coordinates with a width of 80 and height of 100 and the rect of the viewport is at (70,90) with a width of 40 and height of 20 you index with [70-79][0-29] for the x coordinate and [90-99][0-9] for the y. This can be achieved by calculating the index with the following formula:
idx = (n+i)%80 (or%100) where n is the top coordinate(x or y) for the rect and i is in the range for the width/height of the viewport.
This assumes that one step of movement moves the camera with non fractional coordinates.
So this is your second alternative in a little bit more detailed way. If you only want to repeat the terrain, you should separate the contents of the tile. In this case the contents will most likely be generated on the fly since you don't store them.
Hope this helped.